FtpWebRequest 返回“远程服务器返回错误：(530) 未登录”

Question

我收到此错误“远程服务器返回错误：(530) 未登录。”使用 FtpWebRequest 上传文件时。

1. 仅当我将文件传输到具有子文件夹的路径时才会出现错误，否则它完全可以正常工作。
   

2. 上传大约5到10MB的大文件，会超时。

   void FtpTransfer(string siteName, string portNumber, string ftpUser, string ftpPassword, string destPath)
   {
       FtpWebRequest request;
       DateTime now = DateTime.Now;
       string now_string =
           (now.Year).ToString()
           + "_" +
           (now.Month).ToString("0#")
           + "_" +
           (now.Day).ToString("0#");
   
       foreach (object item in listBox1.Items)
       {
           string srcFile = item.ToString();
           lblSource.Text = srcFile;
           Uri uri = new Uri(srcFile);
           string destFile = srcFile.Replace(lblPath.Text, "").Replace("\\\\", "\\").Replace("\\", "/").Replace("www/","");
   
           Configuration oConfig = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
           int timeout = int.Parse(oConfig.AppSettings.Settings["TimeOut"].Value);
   
           if (siteName == "mysite1.co.in" || siteName == "sd1.mysite2.net")
               destFile = "ftp://" + siteName + ":" + portNumber + "/" + siteName + "/_test" + destFile; //error here
           else
               destFile = "ftp://" + siteName + ":" + portNumber + "/" + siteName + destFile; //no error
           lblDestn.Text = destFile;
   
           request = (FtpWebRequest)WebRequest.Create(destFile);
           request.Credentials = new NetworkCredential(ftpUser, ftpPassword);
           request.Timeout = 6000;
           request.Method = WebRequestMethods.Ftp.UploadFile;
           request.UsePassive = true;
           request.UseBinary = true;
           request.KeepAlive = true;
   
           // Copy the contents of the file to the request stream.
           StreamReader sourceStream = new StreamReader(@srcFile);
           byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
           sourceStream.Close();
           request.ContentLength = fileContents.Length;
   
           Stream requestStream = request.GetRequestStream();
           requestStream.Write(fileContents, 0, fileContents.Length);
           requestStream.Close();
   
           FtpWebResponse response = (FtpWebResponse)request.GetResponse();
   
           string path = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]);
           System.IO.StreamWriter w = System.IO.File.AppendText(path + "\\log_" + now_string + ".txt");
           w.WriteLine(DateTime.Now.ToString("yyy-MM-dd HH:mm:ss")
               + " "
               + srcFile
               + " "
               + destFile
               + " "
               + response.StatusDescription);
   
           w.Close();
   
           response.Close();
       }
   

Answer 1

我假设您已经尝试通过标准 FTP 客户端执行相同的操作。如果没有，请尝试一下。然后，我将使用 Wireshark 确保这是来自服务器的响应，并验证是否正在发送凭据。验证后，请与 FTP 所有者联系并确保服务器配置正确。

Answer 2

我不完全知道您的问题的解决方案。但一些建议：

尽可能在

using(...)

课程上使用

IDisposable

。当您完成后，这会促进正确的资源释放和清理。 MSDN：使用

您使用的超时为

6000

毫秒，您可能应该为大文件增加超时时间或使用本地变量

timeout

（从您的应用程序设置中读取）。

使用

using

改进了代码：

private void FtpTransfer(string siteName, string portNumber, string ftpUser, string ftpPassword, string destPath)
        {
            DateTime now = DateTime.Now;
            string now_string =
                (now.Year).ToString()
                + "_" +
                (now.Month).ToString("0#")
                + "_" +
                (now.Day).ToString("0#");

            foreach (object item in listBox1.Items)
            {
                string srcFile = item.ToString();
                lblSource.Text = srcFile;
                Uri uri = new Uri(srcFile);
                string destFile = srcFile.Replace(lblPath.Text, "").Replace("\\\\", "\\").Replace("\\", "/").Replace("www/", "");

                Configuration oConfig = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                int timeout = int.Parse(oConfig.AppSettings.Settings["TimeOut"].Value);

                if (siteName == "mysite1.co.in" || siteName == "sd1.mysite2.net")
                    destFile = "ftp://" + siteName + ":" + portNumber + "/" + siteName + "/_test" + destFile; //error here
                else
                    destFile = "ftp://" + siteName + ":" + portNumber + "/" + siteName + destFile; //no error
                lblDestn.Text = destFile;

                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(destFile);
                request.Credentials = new NetworkCredential(ftpUser, ftpPassword);
                request.Timeout = 6000;
                request.Method = WebRequestMethods.Ftp.UploadFile;
                request.UsePassive = true;
                request.UseBinary = true;
                request.KeepAlive = true;

                // Copy the contents of the file to the request stream.
                byte[] fileContents;
                using (StreamReader sourceStream = new StreamReader(@srcFile))
                {
                    fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
                }
                request.ContentLength = fileContents.Length;

                using (Stream requestStream = request.GetRequestStream())
                {
                    requestStream.Write(fileContents, 0, fileContents.Length);
                }

                using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
                {
                    string path = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]);
                    System.IO.StreamWriter w = System.IO.File.AppendText(path + "\\log_" + now_string + ".txt");
                    w.WriteLine(DateTime.Now.ToString("yyy-MM-dd HH:mm:ss")
                                + " "
                                + srcFile
                                + " "
                                + destFile
                                + " "
                                + response.StatusDescription);

                }
            }

        }